Preparation of (Ti, Sn)O2 Nano-Composite Photocatalyst by Supercritical Fluid Dry Combination Technology |
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Authors: | Jingchang ZHANG Qing LI Weiliang CAO |
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Affiliation: | Institute of Modern Catalysis, The Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract: | A series of TiO2-SnO2 nano-sized composite photo-catalysts containing Sn (9.3%~30.1%) were prepared from TiCl4and SnCl4.5H2O by using sol-gel, supercritical fluid dry and solid-phase reaction (SCFD) combination technology.Characterizations with X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier Transform Infrared Spectroscopy (FTIR) showed that, in addition to anatase type TiO2, a new active phase (Ti, Sn)O2 (with particle size of 2.0~4.3 nm) formed, and there were no SnO2 crystals observed in the range of the doping concentration studied. Photo-catalytic reaction of phenol was used as a model reaction to evaluate the catalytic activities of the obtained catalysts. Compared with pure TiO2 or Ti-Sn catalyst prepared with general sol-gel method, Ti-Sn nanocomposite photo-catalyst thus obtained showed significant improvement in catalytic activity. The photo-catalytic degradation rate of phenol could reach as high as 93.5% after 7 h. The preparation conditions of the new phase (Ti, Sn)O2 were investigated and its catalytic mechanism was proposed. The photo-catalytic particles prepared using SCFD combination technology exhibited small particle size, large surface area and high activity. |
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Keywords: | Anatase TiO2 (Ti,Sn)O2 Photo-catalytic Supercritical fluid dry method Solid-phase reaction |
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